7/23/2019 Chem 114_ Work Sheet_08

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Chem 114 General Chemistry II

T.A. Upul Jayarathne

Work Sheet 08

1)  Give the units for the following rate constant in the following rate laws.

a. Rate = k[NO]2[O2] b. Rate = k[O3]2/[O2] c. k[H2][Br 2]1/2

2)  The simple decomposition reaction AB A + B

is found to have a rate law of rate = k[AB]2 and k =0.2 L/mol-s. How long will it take

for [AB] to reach a concentration of 0.50 M when its initial concentration is 1.50 M?

3) For the reaction: 2ClO2 + 2OH- → ClO3 - + ClO2- + H2O the rate was found to

be first order in [OH-] and second order in [ClO2].

a. Write the rate law for this reaction

b. What happens to the rate if [ClO2] is doubled?

c. What happens to the rate if the volume is doubled at constant pH?

4) The half –life for the radioactive decay of C-14 is 5730 years and is independent of the

initial concentration. How long does it take for 25% of the C-14 atoms in a sample of C-14 to

decay. If a sample of C-14 initially contain 1.5 mmol of C-14, how many millimoles are left after2255 years?